I ended up buying mine directly from Banks...I couldn't find a used one at the time. It's actually two pieces, so you'll need two part numbers.
The Banks pipe is actually quite small in diameter...if you have good fabrication skills, I'd recommend you make one yourself. The worst part is the way Banks snakes the pipe around under the front of the engine.....it would take some work.
Good luck!
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter